Blueair

Pure 511i Max

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Blueair Pure 511i Max

Overall

#195 in

Air Purifiers

according to Reddit Icon Reddit

User sentiment71% positive
5
1
1

Top Pros

Top Cons

Last updated: Apr 8, 2026

Reddit Reviews

Reddit IconBonusAdventurous9162 0.4
r/AirPurifiersWhat air purifiers are good
5 months ago

I have a Blueair 511i max for my room which is 11ftlong and about 7ft tall and about 7ft wider does a decent job but I still get back I got for my stuffy nose and the dust which is does quite good at reducing the dust but my nose still feels horrible any suggestions I usually run it on 2-3 speed

Reddit Iconcommonwoodnymph 0.4
r/AirPurifiersRecommendations under $250 for cat litter odor in a ~400 sq ft space?
about 1 month ago

If you haven’t tried them, the stainless steel litter boxes really helped the odor problem in our situation. I also use in conjunction with the blue air 511max in a small bedroom.

Reddit IconCreative-Sky237 0.4
r/AirPurifiersIs the consensus Coway Air Purifiers?
about 2 months ago

I just bought a blueair 511i Max because it's supposed to be the quietest and I'm underwhelmed. I bought it for a small living room to keep the air fresh and it seems to create a dusty odor instead? There's also an audible machine whir even on the lowest setting. I'm considering sending it back and trying the Levoit Vital 100 or the Core 300-P instead. I prefer the size/shape of the Core 300-P, but reviews suggest the vital is better with odors. Since you have both, could you speak to the difference in terms of sound and odor control?

Reddit Iconjcnlb 0.4
r/AirPurifiersPossible to get an air purifier that doesn't poison the air with noxious smells?
3 months ago

So I got my blue air 511i max and there was no smell. Air smells so clean and fresh to me. I hate chemical smells and this didn’t have any. I bought three so I can have one in every room. One arrived damaged but I’m exchanging. The other two are great and I love them so much.

Reddit IconRaptor07 0.4
r/homeassistantWhat is the Best Air Purifier now you'd recommend for people who are trying to find the RIGHT one for home?
4 months ago

We have 2 BlueAir 211i Max for our living room and upstairs and a 511i Max and humidifier for our kids room. I'm in Salt Lake City, UT where we get heavy pollution in the winter inversions and occasional forest fire smoke in the summer. These purifies make easy work of keeping the air clean and work perfectly with HA. They also have a nice look to them so they aren't as much of an eye sore.

Reddit IconTravishamockry 0.4
r/homeassistantWhat is the Best Air Purifier now you'd recommend for people who are trying to find the RIGHT one for home?
4 months ago

Seconding this. I have two Blueairs too. I have a 511i Max also for my bedroom and the new Signature for the living room. Works well and good stats in HA, which is all I really wanted.

Reddit IconCmee4svc 0.3
Reddit IconDull_Apple1455 0.3
r/BuyItForLifeLooking for a high-quality air purifier that's built to last.
8 months ago

Unfortunatly, i had at Blueair 411 formabout 5 years in the bedroom. It just stopped working. So I replaced it with the newer 511

Reddit IconInspectionNo9124 0.3
r/AirPurifiersFirst air purifier recommendation
4 months ago

It’s honestly so good! I initially started with the 511, 5 years ago and recently just upgraded to the blue signature (during Black Friday) which is the prettiest out of the bunch! lol I’d absolutely get the 311 for our other rooms— gotta wait for another sale tho lol

Reddit IconLong_Zookeepergame25 0.3
r/AirPurifiersBlue Air 511 - Buyers Regret
12 months ago

BlueAir not having true HEPA and just a HEPA-type filter is fine. Multiple official testing sources show them pushing benchmarks similar to other true hepa rated units by popular brands. They still pull dust and still filter air just fine. They do have an ionizer and do produce extremely minuscule amounts of ozone. That’s why they’re certified. However, they are (especially the 511) weak units with a low CADR. If you want better performance, definitely return for a different unit or a stronger BlueAir model like the 211